Mix "dough additives" and set aside to cool.,Sponge yeast, sugar, water; when foamy, add luke-warm/cool sour cream mixture, blend well, then add remaining dough ingredients, mixing thoroughly.,______,Mix filling ingredients in a medium bowl, set aside.,Prepare two cookie sheet pans (grease or use parchment paper); set aside.,Divide dough into four parts; transfer one part to a well-floured surface, pat into a rectangle, then roll into a 14x8 inch rectangle (approx).,Spread one-fourth of the filling over the dough rectangle, lightly roll up (start on the long side closest to you).,Transfer roll to prepped cookie sheet, seam-side down, curve into a cresent shape.,At one-inch intervals, use scissors to snip about 2/3's into the roll (exposing the roll & cream cheese filling).,Repeat with remaining dough & filling.,Let rise in warm place about 1-2 hours.,Bake at 350 for 20 minutes (golden brown).,Mix icing ingredients in a small bowl, spread over tops of cooled loaves.